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From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10434) Store Tag compression information for a WAL in its header
Date Wed, 29 Jan 2014 22:28:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13885915#comment-13885915
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Jeffrey Zhong commented on HBASE-10434:
---------------------------------------

[~anoopsamjohn] I saw your changed CompressionContext constructor. Though we mark it as Private,
Phoenix is using it. The similar thing also happened for Phoenix as well on KeyValue on earlier
changes. Thanks. 

> Store Tag compression information for a WAL in its header
> ---------------------------------------------------------
>
>                 Key: HBASE-10434
>                 URL: https://issues.apache.org/jira/browse/HBASE-10434
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.0
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 0.98.0, 0.99.0
>
>         Attachments: HBASE-10434.patch
>
>
> We can enable/disable tag compression along with WAL compression using the config,
> hbase.regionserver.wal.tags.enablecompression ->  Defaults to true so that compress
tags when WAL compress is ON.
> We are not storing this info abt whether a WAL containing compressed tags or not in the
WAL header and use that in the read path. So dynamic change of this in some servers may cause
issue when  an RS having this value as true have to read and split a WAL generated from n
RS where this value was false.



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